Support a commit boost signing domain #70
Description
To protect validator keys, we're currently using a "proxy key" approach, where the validator key is used to sign a delegation to a new key. We're also evaluating removing the ability for modules to request signatures from consensus keys altogether in #58 .
An alternative for BLS keys could be to use a different signing domain altogether, which would mean that messages can be signed without risking any slashing.
Notes:
- if we have a single "commit boost signing domains", then it would be the same across modules (so potentially a signature for module A could be a valid signature for module B)
- we would still need to support proxy keys if we want to support additional schemes, eg ECDSA